The duration of physical activity has proven to be more important than its type or intensity for controlling blood sugar levels, according to a study published in Medicine & Science in Sports & Exercise (MSSE).

The study included 58 adults recently diagnosed with type 2 diabetes. Over 26 weeks, scientists tracked their physical activity using fitness bracelets and analyzed changes in glucose levels and glycated hemoglobin, a key indicator of long-term blood sugar control.

It turned out that the length of exercise sessions had the strongest association with improved outcomes. Neither intensity nor the type of exercise—whether strength or aerobic—had a significant independent effect. Longer workouts were especially important during the first weeks of the program.

Researchers estimate that increasing the average session duration from 30 to 45 minutes is associated with a reduction in glycated hemoglobin of about 0.3%. Although this effect may seem small, with regular exercise it can significantly influence overall health.

The authors note that the findings help simplify recommendations for patients: instead of complex workout plans, it is enough to focus on increasing the duration of activity. In their view, building a habit of longer but comfortable exercise sessions may be one of the most effective strategies for blood sugar control.

Earlier, scientists found that low magnesium levels can contribute to the development of diabetic retinopathy.